1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1998-2016 Dag-Erling Smørgrav 5 * Copyright (c) 2013 Michael Gmelin <freebsd@grem.de> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer 13 * in this position and unchanged. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/param.h> 33 #include <sys/socket.h> 34 #include <sys/time.h> 35 #include <sys/uio.h> 36 37 #include <netinet/in.h> 38 39 #include <ctype.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <inttypes.h> 43 #include <netdb.h> 44 #include <paths.h> 45 #include <poll.h> 46 #include <pwd.h> 47 #include <stdarg.h> 48 #include <stdlib.h> 49 #include <stdio.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 #ifdef WITH_SSL 54 #include <openssl/x509v3.h> 55 #endif 56 57 #include "fetch.h" 58 #include "common.h" 59 60 61 /*** Local data **************************************************************/ 62 63 /* 64 * Error messages for resolver errors 65 */ 66 static struct fetcherr netdb_errlist[] = { 67 #ifdef EAI_ADDRFAMILY 68 { EAI_ADDRFAMILY, FETCH_RESOLV, "Address family for host not supported" }, 69 #endif 70 #ifdef EAI_NODATA 71 { EAI_NODATA, FETCH_RESOLV, "No address for host" }, 72 #endif 73 { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 74 { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, 75 { EAI_NONAME, FETCH_RESOLV, "Host does not resolve" }, 76 { -1, FETCH_UNKNOWN, "Unknown resolver error" } 77 }; 78 79 /* 80 * SOCKS5 error enumerations 81 */ 82 enum SOCKS5_ERR { 83 /* Protocol errors */ 84 SOCKS5_ERR_SELECTION, 85 SOCKS5_ERR_READ_METHOD, 86 SOCKS5_ERR_VER5_ONLY, 87 SOCKS5_ERR_NOMETHODS, 88 SOCKS5_ERR_NOTIMPLEMENTED, 89 SOCKS5_ERR_HOSTNAME_SIZE, 90 SOCKS5_ERR_REQUEST, 91 SOCKS5_ERR_REPLY, 92 SOCKS5_ERR_NON_VER5_RESP, 93 SOCKS5_ERR_GENERAL, 94 SOCKS5_ERR_NOT_ALLOWED, 95 SOCKS5_ERR_NET_UNREACHABLE, 96 SOCKS5_ERR_HOST_UNREACHABLE, 97 SOCKS5_ERR_CONN_REFUSED, 98 SOCKS5_ERR_TTL_EXPIRED, 99 SOCKS5_ERR_COM_UNSUPPORTED, 100 SOCKS5_ERR_ADDR_UNSUPPORTED, 101 SOCKS5_ERR_UNSPECIFIED, 102 /* Configuration errors */ 103 SOCKS5_ERR_BAD_HOST, 104 SOCKS5_ERR_BAD_PROXY_FORMAT, 105 SOCKS5_ERR_BAD_PORT 106 }; 107 108 /* 109 * Error messages for SOCKS5 errors 110 */ 111 static struct fetcherr socks5_errlist[] = { 112 /* SOCKS5 protocol errors */ 113 { SOCKS5_ERR_SELECTION, FETCH_ABORT, "SOCKS5: Failed to send selection method" }, 114 { SOCKS5_ERR_READ_METHOD, FETCH_ABORT, "SOCKS5: Failed to read method" }, 115 { SOCKS5_ERR_VER5_ONLY, FETCH_PROTO, "SOCKS5: Only version 5 is implemented" }, 116 { SOCKS5_ERR_NOMETHODS, FETCH_PROTO, "SOCKS5: No acceptable methods" }, 117 { SOCKS5_ERR_NOTIMPLEMENTED, FETCH_PROTO, "SOCKS5: Method currently not implemented" }, 118 { SOCKS5_ERR_HOSTNAME_SIZE, FETCH_PROTO, "SOCKS5: Hostname size is above 256 bytes" }, 119 { SOCKS5_ERR_REQUEST, FETCH_PROTO, "SOCKS5: Failed to request" }, 120 { SOCKS5_ERR_REPLY, FETCH_PROTO, "SOCKS5: Failed to receive reply" }, 121 { SOCKS5_ERR_NON_VER5_RESP, FETCH_PROTO, "SOCKS5: Server responded with a non-version 5 response" }, 122 { SOCKS5_ERR_GENERAL, FETCH_ABORT, "SOCKS5: General server failure" }, 123 { SOCKS5_ERR_NOT_ALLOWED, FETCH_AUTH, "SOCKS5: Connection not allowed by ruleset" }, 124 { SOCKS5_ERR_NET_UNREACHABLE, FETCH_NETWORK, "SOCKS5: Network unreachable" }, 125 { SOCKS5_ERR_HOST_UNREACHABLE, FETCH_ABORT, "SOCKS5: Host unreachable" }, 126 { SOCKS5_ERR_CONN_REFUSED, FETCH_ABORT, "SOCKS5: Connection refused" }, 127 { SOCKS5_ERR_TTL_EXPIRED, FETCH_TIMEOUT, "SOCKS5: TTL expired" }, 128 { SOCKS5_ERR_COM_UNSUPPORTED, FETCH_PROTO, "SOCKS5: Command not supported" }, 129 { SOCKS5_ERR_ADDR_UNSUPPORTED, FETCH_ABORT, "SOCKS5: Address type not supported" }, 130 { SOCKS5_ERR_UNSPECIFIED, FETCH_UNKNOWN, "SOCKS5: Unspecified error" }, 131 /* Configuration error */ 132 { SOCKS5_ERR_BAD_HOST, FETCH_ABORT, "SOCKS5: Bad proxy host" }, 133 { SOCKS5_ERR_BAD_PROXY_FORMAT, FETCH_ABORT, "SOCKS5: Bad proxy format" }, 134 { SOCKS5_ERR_BAD_PORT, FETCH_ABORT, "SOCKS5: Bad port" } 135 }; 136 137 /* End-of-Line */ 138 static const char ENDL[2] = { '\r', '\n' }; 139 140 141 /*** Error-reporting functions ***********************************************/ 142 143 /* 144 * Map error code to string 145 */ 146 static struct fetcherr * 147 fetch_finderr(struct fetcherr *p, int e) 148 { 149 while (p->num != -1 && p->num != e) 150 p++; 151 return (p); 152 } 153 154 /* 155 * Set error code 156 */ 157 void 158 fetch_seterr(struct fetcherr *p, int e) 159 { 160 p = fetch_finderr(p, e); 161 fetchLastErrCode = p->cat; 162 snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); 163 } 164 165 /* 166 * Set error code according to errno 167 */ 168 void 169 fetch_syserr(void) 170 { 171 switch (errno) { 172 case 0: 173 fetchLastErrCode = FETCH_OK; 174 break; 175 case EPERM: 176 case EACCES: 177 case EROFS: 178 case EAUTH: 179 case ENEEDAUTH: 180 fetchLastErrCode = FETCH_AUTH; 181 break; 182 case ENOENT: 183 case EISDIR: /* XXX */ 184 fetchLastErrCode = FETCH_UNAVAIL; 185 break; 186 case ENOMEM: 187 fetchLastErrCode = FETCH_MEMORY; 188 break; 189 case EBUSY: 190 case EAGAIN: 191 fetchLastErrCode = FETCH_TEMP; 192 break; 193 case EEXIST: 194 fetchLastErrCode = FETCH_EXISTS; 195 break; 196 case ENOSPC: 197 fetchLastErrCode = FETCH_FULL; 198 break; 199 case EADDRINUSE: 200 case EADDRNOTAVAIL: 201 case ENETDOWN: 202 case ENETUNREACH: 203 case ENETRESET: 204 case EHOSTUNREACH: 205 fetchLastErrCode = FETCH_NETWORK; 206 break; 207 case ECONNABORTED: 208 case ECONNRESET: 209 fetchLastErrCode = FETCH_ABORT; 210 break; 211 case ETIMEDOUT: 212 fetchLastErrCode = FETCH_TIMEOUT; 213 break; 214 case ECONNREFUSED: 215 case EHOSTDOWN: 216 fetchLastErrCode = FETCH_DOWN; 217 break; 218 default: 219 fetchLastErrCode = FETCH_UNKNOWN; 220 } 221 snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); 222 } 223 224 225 /* 226 * Emit status message 227 */ 228 void 229 fetch_info(const char *fmt, ...) 230 { 231 va_list ap; 232 int serrno = errno; 233 234 va_start(ap, fmt); 235 vfprintf(stderr, fmt, ap); 236 va_end(ap); 237 fputc('\n', stderr); 238 errno = serrno; 239 } 240 #define fetch_verbose(...) \ 241 do { if (verbose) fetch_info(__VA_ARGS__); } while (0) 242 243 244 /*** Network-related utility functions ***************************************/ 245 246 /* 247 * Return the default port for a scheme 248 */ 249 int 250 fetch_default_port(const char *scheme) 251 { 252 struct servent *se; 253 254 if ((se = getservbyname(scheme, "tcp")) != NULL) 255 return (ntohs(se->s_port)); 256 if (strcmp(scheme, SCHEME_FTP) == 0) 257 return (FTP_DEFAULT_PORT); 258 if (strcmp(scheme, SCHEME_HTTP) == 0) 259 return (HTTP_DEFAULT_PORT); 260 return (0); 261 } 262 263 /* 264 * Return the default proxy port for a scheme 265 */ 266 int 267 fetch_default_proxy_port(const char *scheme) 268 { 269 if (strcmp(scheme, SCHEME_FTP) == 0) 270 return (FTP_DEFAULT_PROXY_PORT); 271 if (strcmp(scheme, SCHEME_HTTP) == 0) 272 return (HTTP_DEFAULT_PROXY_PORT); 273 return (0); 274 } 275 276 277 /* 278 * Create a connection for an existing descriptor. 279 */ 280 conn_t * 281 fetch_reopen(int sd) 282 { 283 conn_t *conn; 284 int flags; 285 int opt = 1; 286 287 /* allocate and fill connection structure */ 288 if ((conn = calloc(1, sizeof(*conn))) == NULL) 289 return (NULL); 290 flags = fcntl(sd, F_GETFD); 291 if (flags != -1 && (flags & FD_CLOEXEC) == 0) 292 (void)fcntl(sd, F_SETFD, flags | FD_CLOEXEC); 293 flags = fcntl(sd, F_GETFL); 294 if (flags != -1 && (flags & O_NONBLOCK) == 0) 295 (void)fcntl(sd, F_SETFL, flags | O_NONBLOCK); 296 (void)setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt)); 297 conn->sd = sd; 298 ++conn->ref; 299 return (conn); 300 } 301 302 303 /* 304 * Resolve an address 305 */ 306 struct addrinfo * 307 fetch_resolve(const char *addr, int port, int af) 308 { 309 char hbuf[256], sbuf[8]; 310 struct addrinfo hints, *res; 311 const char *hb, *he, *sep; 312 const char *host, *service; 313 int err, len; 314 315 /* first, check for a bracketed IPv6 address */ 316 if (*addr == '[') { 317 hb = addr + 1; 318 if ((sep = strchr(hb, ']')) == NULL) { 319 errno = EINVAL; 320 goto syserr; 321 } 322 he = sep++; 323 } else { 324 hb = addr; 325 sep = strchrnul(hb, ':'); 326 he = sep; 327 } 328 329 /* see if we need to copy the host name */ 330 if (*he != '\0') { 331 len = snprintf(hbuf, sizeof(hbuf), 332 "%.*s", (int)(he - hb), hb); 333 if (len < 0) 334 goto syserr; 335 if (len >= (int)sizeof(hbuf)) { 336 errno = ENAMETOOLONG; 337 goto syserr; 338 } 339 host = hbuf; 340 } else { 341 host = hb; 342 } 343 344 /* was it followed by a service name? */ 345 if (*sep == '\0' && port != 0) { 346 if (port < 1 || port > 65535) { 347 errno = EINVAL; 348 goto syserr; 349 } 350 if (snprintf(sbuf, sizeof(sbuf), "%d", port) < 0) 351 goto syserr; 352 service = sbuf; 353 } else if (*sep != '\0') { 354 service = sep + 1; 355 } else { 356 service = NULL; 357 } 358 359 /* resolve */ 360 memset(&hints, 0, sizeof(hints)); 361 hints.ai_family = af; 362 hints.ai_socktype = SOCK_STREAM; 363 hints.ai_flags = AI_ADDRCONFIG; 364 if ((err = getaddrinfo(host, service, &hints, &res)) != 0) { 365 netdb_seterr(err); 366 return (NULL); 367 } 368 return (res); 369 syserr: 370 fetch_syserr(); 371 return (NULL); 372 } 373 374 375 /* 376 * Bind a socket to a specific local address 377 */ 378 int 379 fetch_bind(int sd, int af, const char *addr) 380 { 381 struct addrinfo *cliai, *ai; 382 int err; 383 384 if ((cliai = fetch_resolve(addr, 0, af)) == NULL) 385 return (-1); 386 for (ai = cliai; ai != NULL; ai = ai->ai_next) 387 if ((err = bind(sd, ai->ai_addr, ai->ai_addrlen)) == 0) 388 break; 389 if (err != 0) 390 fetch_syserr(); 391 freeaddrinfo(cliai); 392 return (err == 0 ? 0 : -1); 393 } 394 395 396 /* 397 * SOCKS5 connection initiation, based on RFC 1928 398 * Default DNS resolution over SOCKS5 399 */ 400 int 401 fetch_socks5_init(conn_t *conn, const char *host, int port, int verbose) 402 { 403 /* 404 * Size is based on largest packet prefix (4 bytes) + 405 * Largest FQDN (256) + one byte size (1) + 406 * Port (2) 407 */ 408 unsigned char buf[BUFF_SIZE]; 409 unsigned char *ptr; 410 int ret = 1; 411 412 fetch_verbose("Initializing SOCKS5 connection: %s:%d", host, port); 413 414 /* Connection initialization */ 415 ptr = buf; 416 *ptr++ = SOCKS_VERSION_5; 417 *ptr++ = SOCKS_CONNECTION; 418 *ptr++ = SOCKS_RSV; 419 420 if (fetch_write(conn, buf, 3) != 3) { 421 ret = SOCKS5_ERR_SELECTION; 422 goto fail; 423 } 424 425 /* Verify response from SOCKS5 server */ 426 if (fetch_read(conn, buf, 2) != 2) { 427 ret = SOCKS5_ERR_READ_METHOD; 428 goto fail; 429 } 430 431 ptr = buf; 432 if (ptr[0] != SOCKS_VERSION_5) { 433 ret = SOCKS5_ERR_VER5_ONLY; 434 goto fail; 435 } 436 if (ptr[1] == SOCKS_NOMETHODS) { 437 ret = SOCKS5_ERR_NOMETHODS; 438 goto fail; 439 } 440 else if (ptr[1] != SOCKS5_NOTIMPLEMENTED) { 441 ret = SOCKS5_ERR_NOTIMPLEMENTED; 442 goto fail; 443 } 444 445 /* Send Request */ 446 *ptr++ = SOCKS_VERSION_5; 447 *ptr++ = SOCKS_CONNECTION; 448 *ptr++ = SOCKS_RSV; 449 /* Encode all targets as a hostname to avoid DNS leaks */ 450 *ptr++ = SOCKS_ATYP_DOMAINNAME; 451 if (strlen(host) > FQDN_SIZE) { 452 ret = SOCKS5_ERR_HOSTNAME_SIZE; 453 goto fail; 454 } 455 *ptr++ = strlen(host); 456 memcpy(ptr, host, strlen(host)); 457 ptr = ptr + strlen(host); 458 459 port = htons(port); 460 *ptr++ = port & 0x00ff; 461 *ptr++ = (port & 0xff00) >> 8; 462 463 if (fetch_write(conn, buf, ptr - buf) != ptr - buf) { 464 ret = SOCKS5_ERR_REQUEST; 465 goto fail; 466 } 467 468 /* BND.ADDR is variable length, read the largest on non-blocking socket */ 469 if (!fetch_read(conn, buf, BUFF_SIZE)) { 470 ret = SOCKS5_ERR_REPLY; 471 goto fail; 472 } 473 474 ptr = buf; 475 if (*ptr++ != SOCKS_VERSION_5) { 476 ret = SOCKS5_ERR_NON_VER5_RESP; 477 goto fail; 478 } 479 480 switch (*ptr++) { 481 case SOCKS_SUCCESS: 482 break; 483 case SOCKS_GENERAL_FAILURE: 484 ret = SOCKS5_ERR_GENERAL; 485 goto fail; 486 case SOCKS_CONNECTION_NOT_ALLOWED: 487 ret = SOCKS5_ERR_NOT_ALLOWED; 488 goto fail; 489 case SOCKS_NETWORK_UNREACHABLE: 490 ret = SOCKS5_ERR_NET_UNREACHABLE; 491 goto fail; 492 case SOCKS_HOST_UNREACHABLE: 493 ret = SOCKS5_ERR_HOST_UNREACHABLE; 494 goto fail; 495 case SOCKS_CONNECTION_REFUSED: 496 ret = SOCKS5_ERR_CONN_REFUSED; 497 goto fail; 498 case SOCKS_TTL_EXPIRED: 499 ret = SOCKS5_ERR_TTL_EXPIRED; 500 goto fail; 501 case SOCKS_COMMAND_NOT_SUPPORTED: 502 ret = SOCKS5_ERR_COM_UNSUPPORTED; 503 goto fail; 504 case SOCKS_ADDRESS_NOT_SUPPORTED: 505 ret = SOCKS5_ERR_ADDR_UNSUPPORTED; 506 goto fail; 507 default: 508 ret = SOCKS5_ERR_UNSPECIFIED; 509 goto fail; 510 } 511 512 return (ret); 513 514 fail: 515 socks5_seterr(ret); 516 return (0); 517 } 518 519 /* 520 * Perform SOCKS5 initialization 521 */ 522 int 523 fetch_socks5_getenv(char **host, int *port) 524 { 525 char *socks5env, *endptr, *ext; 526 const char *portDelim; 527 size_t slen; 528 529 portDelim = ":"; 530 if ((socks5env = getenv("SOCKS5_PROXY")) == NULL || *socks5env == '\0') { 531 *host = NULL; 532 *port = -1; 533 return (-1); 534 } 535 536 /* 537 * IPv6 addresses begin and end in brackets. Set the port delimiter 538 * accordingly and search for it so we can do appropriate validation. 539 */ 540 if (socks5env[0] == '[') 541 portDelim = "]:"; 542 543 slen = strlen(socks5env); 544 ext = strstr(socks5env, portDelim); 545 if (socks5env[0] == '[') { 546 if (socks5env[slen - 1] == ']') { 547 *host = strndup(socks5env, slen); 548 } else if (ext != NULL) { 549 *host = strndup(socks5env, ext - socks5env + 1); 550 } else { 551 socks5_seterr(SOCKS5_ERR_BAD_PROXY_FORMAT); 552 return (0); 553 } 554 } else { 555 *host = strndup(socks5env, ext - socks5env); 556 } 557 558 if (*host == NULL) 559 return (-1); 560 if (ext == NULL) { 561 *port = 1080; /* Default port as defined in RFC1928 */ 562 } else { 563 ext += strlen(portDelim); 564 errno = 0; 565 *port = strtoimax(ext, (char **)&endptr, 10); 566 if (*endptr != '\0' || errno != 0 || *port < 0 || 567 *port > 65535) { 568 free(*host); 569 *host = NULL; 570 socks5_seterr(SOCKS5_ERR_BAD_PORT); 571 return (0); 572 } 573 } 574 575 return (2); 576 } 577 578 579 /* 580 * Establish a TCP connection to the specified port on the specified host. 581 */ 582 conn_t * 583 fetch_connect(const char *host, int port, int af, int verbose) 584 { 585 struct timeval now, timeout, delta; 586 struct pollfd pfd; 587 struct addrinfo *cais = NULL, *sais = NULL, *cai, *sai; 588 const char *bindaddr; 589 conn_t *conn = NULL; 590 int err = 0, sd = -1; 591 int deltams; 592 char *sockshost; 593 int socksport; 594 595 DEBUGF("---> %s:%d\n", host, port); 596 597 /* 598 * Check if SOCKS5_PROXY env variable is set. fetch_socks5_getenv 599 * will either set sockshost = NULL or allocate memory in all cases. 600 */ 601 sockshost = NULL; 602 if (!fetch_socks5_getenv(&sockshost, &socksport)) 603 goto fail; 604 605 /* Not using SOCKS5 proxy */ 606 if (sockshost == NULL) { 607 /* resolve server address */ 608 fetch_verbose("resolving server address: %s:%d", host, port); 609 if ((sais = fetch_resolve(host, port, af)) == NULL) 610 goto fail; 611 612 /* resolve client address */ 613 bindaddr = getenv("FETCH_BIND_ADDRESS"); 614 if (bindaddr != NULL && *bindaddr != '\0') { 615 fetch_verbose("resolving client address: %s", bindaddr); 616 if ((cais = fetch_resolve(bindaddr, 0, af)) == NULL) 617 goto fail; 618 } 619 } else { 620 /* resolve socks5 proxy address */ 621 fetch_verbose("resolving SOCKS5 server address: %s:%d", 622 sockshost, socksport); 623 if ((sais = fetch_resolve(sockshost, socksport, af)) == NULL) { 624 socks5_seterr(SOCKS5_ERR_BAD_HOST); 625 goto fail; 626 } 627 } 628 629 /* try each server address in turn */ 630 for (err = 0, sai = sais; sai != NULL; sai = sai->ai_next) { 631 /* open socket */ 632 if ((sd = socket(sai->ai_family, SOCK_STREAM, 0)) < 0) { 633 err = -1; 634 if (errno == EAFNOSUPPORT || errno == EPROTONOSUPPORT) 635 continue; 636 goto syserr; 637 } 638 /* attempt to bind to client address */ 639 for (err = 0, cai = cais; cai != NULL; cai = cai->ai_next) { 640 if (cai->ai_family != sai->ai_family) 641 continue; 642 if ((err = bind(sd, cai->ai_addr, cai->ai_addrlen)) == 0) 643 break; 644 } 645 if (err != 0) { 646 fetch_verbose("failed to bind to %s", bindaddr); 647 goto syserr; 648 } 649 /* make the socket non-blocking */ 650 (void)fcntl(sd, F_SETFL, O_NONBLOCK); 651 /* start the clock */ 652 if (fetchTimeout > 0) { 653 gettimeofday(&timeout, NULL); 654 timeout.tv_sec += fetchTimeout; 655 deltams = fetchTimeout * 1000; 656 } 657 /* attempt to connect to server address */ 658 if ((err = connect(sd, sai->ai_addr, sai->ai_addrlen)) == 0) 659 break; 660 /* wait for connection */ 661 if (errno == EINPROGRESS) { 662 deltams = INFTIM; 663 pfd.fd = sd; 664 pfd.events = POLLOUT; 665 for (;;) { 666 /* wait for something to happen */ 667 if (poll(&pfd, 1, deltams) >= 0) 668 break; 669 if (errno == EINTR && !fetchRestartCalls) 670 break; 671 /* check the clock */ 672 if (fetchTimeout > 0) { 673 gettimeofday(&now, NULL); 674 if (!timercmp(&timeout, &now, >)) { 675 errno = ETIMEDOUT; 676 pfd.revents = POLLERR; 677 break; 678 } 679 timersub(&timeout, &now, &delta); 680 deltams = delta.tv_sec * 1000 + 681 delta.tv_usec / 1000; 682 } 683 } 684 if (pfd.revents == POLLOUT) { 685 /* connection established */ 686 err = 0; 687 break; 688 } 689 } 690 /* clean up before next attempt */ 691 close(sd); 692 sd = -1; 693 } 694 if (err != 0) { 695 if (verbose && sockshost == NULL) { 696 fetch_info("failed to connect to %s:%d", host, port); 697 goto syserr; 698 } else if (sockshost != NULL) { 699 fetch_verbose("failed to connect to SOCKS5 server %s:%d", 700 sockshost, socksport); 701 socks5_seterr(SOCKS5_ERR_CONN_REFUSED); 702 goto fail; 703 } 704 goto syserr; 705 } 706 707 if ((conn = fetch_reopen(sd)) == NULL) 708 goto syserr; 709 710 if (sockshost) 711 if (!fetch_socks5_init(conn, host, port, verbose)) 712 goto fail; 713 free(sockshost); 714 if (cais != NULL) 715 freeaddrinfo(cais); 716 if (sais != NULL) 717 freeaddrinfo(sais); 718 return (conn); 719 syserr: 720 fetch_syserr(); 721 fail: 722 free(sockshost); 723 /* Fully close if it was opened; otherwise just don't leak the fd. */ 724 if (conn != NULL) 725 fetch_close(conn); 726 else if (sd >= 0) 727 close(sd); 728 if (cais != NULL) 729 freeaddrinfo(cais); 730 if (sais != NULL) 731 freeaddrinfo(sais); 732 return (NULL); 733 } 734 735 #ifdef WITH_SSL 736 /* 737 * Convert characters A-Z to lowercase (intentionally avoid any locale 738 * specific conversions). 739 */ 740 static char 741 fetch_ssl_tolower(char in) 742 { 743 if (in >= 'A' && in <= 'Z') 744 return (in + 32); 745 else 746 return (in); 747 } 748 749 /* 750 * isalpha implementation that intentionally avoids any locale specific 751 * conversions. 752 */ 753 static int 754 fetch_ssl_isalpha(char in) 755 { 756 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); 757 } 758 759 /* 760 * Check if passed hostnames a and b are equal. 761 */ 762 static int 763 fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, 764 size_t blen) 765 { 766 size_t i; 767 768 if (alen != blen) 769 return (0); 770 for (i = 0; i < alen; ++i) { 771 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) 772 return (0); 773 } 774 return (1); 775 } 776 777 /* 778 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 779 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- 780 * numeric characters. Double hyphens (like they're found in IDN a-labels 781 * 'xn--') are not allowed. Empty labels are invalid. 782 */ 783 static int 784 fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) 785 { 786 size_t i; 787 788 if (!len || l[0] == '-' || l[len-1] == '-') 789 return (0); 790 for (i = 0; i < len; ++i) { 791 if (!isdigit(l[i]) && 792 !fetch_ssl_isalpha(l[i]) && 793 !(l[i] == '*' && wcok) && 794 !(l[i] == '-' && l[i - 1] != '-')) 795 return (0); 796 } 797 return (1); 798 } 799 800 /* 801 * Check if host name consists only of numbers. This might indicate an IP 802 * address, which is not a good idea for CN wildcard comparison. 803 */ 804 static int 805 fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) 806 { 807 size_t i; 808 809 for (i = 0; i < len; ++i) { 810 if (!((hostname[i] >= '0' && hostname[i] <= '9') || 811 hostname[i] == '.')) 812 return (0); 813 } 814 return (1); 815 } 816 817 /* 818 * Check if the host name h passed matches the pattern passed in m which 819 * is usually part of subjectAltName or CN of a certificate presented to 820 * the client. This includes wildcard matching. The algorithm is based on 821 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. 822 */ 823 static int 824 fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, 825 size_t mlen) 826 { 827 int delta, hdotidx, mdot1idx, wcidx; 828 const char *hdot, *mdot1, *mdot2; 829 const char *wc; /* wildcard */ 830 831 if (!(h && *h && m && *m)) 832 return (0); 833 if ((wc = strnstr(m, "*", mlen)) == NULL) 834 return (fetch_ssl_hname_equal(h, hlen, m, mlen)); 835 wcidx = wc - m; 836 /* hostname should not be just dots and numbers */ 837 if (fetch_ssl_hname_is_only_numbers(h, hlen)) 838 return (0); 839 /* only one wildcard allowed in pattern */ 840 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) 841 return (0); 842 /* 843 * there must be at least two more domain labels and 844 * wildcard has to be in the leftmost label (RFC6125) 845 */ 846 mdot1 = strnstr(m, ".", mlen); 847 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) 848 return (0); 849 mdot1idx = mdot1 - m; 850 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); 851 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) 852 return (0); 853 /* hostname must contain a dot and not be the 1st char */ 854 hdot = strnstr(h, ".", hlen); 855 if (hdot == NULL || hdot == h) 856 return (0); 857 hdotidx = hdot - h; 858 /* 859 * host part of hostname must be at least as long as 860 * pattern it's supposed to match 861 */ 862 if (hdotidx < mdot1idx) 863 return (0); 864 /* 865 * don't allow wildcards in non-traditional domain names 866 * (IDN, A-label, U-label...) 867 */ 868 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || 869 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) 870 return (0); 871 /* match domain part (part after first dot) */ 872 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, 873 mlen - mdot1idx)) 874 return (0); 875 /* match part left of wildcard */ 876 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) 877 return (0); 878 /* match part right of wildcard */ 879 delta = mdot1idx - wcidx - 1; 880 if (!fetch_ssl_hname_equal(hdot - delta, delta, 881 mdot1 - delta, delta)) 882 return (0); 883 /* all tests succeeded, it's a match */ 884 return (1); 885 } 886 887 /* 888 * Get numeric host address info - returns NULL if host was not an IP 889 * address. The caller is responsible for deallocation using 890 * freeaddrinfo(3). 891 */ 892 static struct addrinfo * 893 fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) 894 { 895 struct addrinfo hints, *res; 896 char *host; 897 898 host = (char *)malloc(len + 1); 899 memcpy(host, hostname, len); 900 host[len] = '\0'; 901 memset(&hints, 0, sizeof(hints)); 902 hints.ai_family = PF_UNSPEC; 903 hints.ai_socktype = SOCK_STREAM; 904 hints.ai_protocol = 0; 905 hints.ai_flags = AI_NUMERICHOST; 906 /* port is not relevant for this purpose */ 907 if (getaddrinfo(host, "443", &hints, &res) != 0) 908 res = NULL; 909 free(host); 910 return res; 911 } 912 913 /* 914 * Compare ip address in addrinfo with address passes. 915 */ 916 static int 917 fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, 918 size_t rhostlen) 919 { 920 const void *left; 921 922 if (lhost->ai_family == AF_INET && rhostlen == 4) { 923 left = (void *)&((struct sockaddr_in*)(void *) 924 lhost->ai_addr)->sin_addr.s_addr; 925 #ifdef INET6 926 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { 927 left = (void *)&((struct sockaddr_in6 *)(void *) 928 lhost->ai_addr)->sin6_addr; 929 #endif 930 } else 931 return (0); 932 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); 933 } 934 935 /* 936 * Compare ip address in addrinfo with host passed. If host is not an IP 937 * address, comparison will fail. 938 */ 939 static int 940 fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, 941 size_t rlen) 942 { 943 struct addrinfo *raddr; 944 int ret; 945 char *rip; 946 947 ret = 0; 948 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) 949 return 0; /* not a numeric host */ 950 951 if (laddr->ai_family == raddr->ai_family) { 952 if (laddr->ai_family == AF_INET) { 953 rip = (char *)&((struct sockaddr_in *)(void *) 954 raddr->ai_addr)->sin_addr.s_addr; 955 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); 956 #ifdef INET6 957 } else if (laddr->ai_family == AF_INET6) { 958 rip = (char *)&((struct sockaddr_in6 *)(void *) 959 raddr->ai_addr)->sin6_addr; 960 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); 961 #endif 962 } 963 964 } 965 freeaddrinfo(raddr); 966 return (ret); 967 } 968 969 /* 970 * Verify server certificate by subjectAltName. 971 */ 972 static int 973 fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, 974 const char *host, struct addrinfo *ip) 975 { 976 const GENERAL_NAME *name; 977 size_t nslen; 978 int i; 979 const char *ns; 980 981 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { 982 name = sk_GENERAL_NAME_value(altnames, i); 983 ns = (const char *)ASN1_STRING_get0_data(name->d.ia5); 984 nslen = (size_t)ASN1_STRING_length(name->d.ia5); 985 986 if (name->type == GEN_DNS && ip == NULL && 987 fetch_ssl_hname_match(host, strlen(host), ns, nslen)) 988 return (1); 989 else if (name->type == GEN_IPADD && ip != NULL && 990 fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) 991 return (1); 992 } 993 return (0); 994 } 995 996 /* 997 * Verify server certificate by CN. 998 */ 999 static int 1000 fetch_ssl_verify_cn(X509_NAME *subject, const char *host, 1001 struct addrinfo *ip) 1002 { 1003 ASN1_STRING *namedata; 1004 X509_NAME_ENTRY *nameentry; 1005 int cnlen, lastpos, loc, ret; 1006 unsigned char *cn; 1007 1008 ret = 0; 1009 lastpos = -1; 1010 loc = -1; 1011 cn = NULL; 1012 /* get most specific CN (last entry in list) and compare */ 1013 while ((lastpos = X509_NAME_get_index_by_NID(subject, 1014 NID_commonName, lastpos)) != -1) 1015 loc = lastpos; 1016 1017 if (loc > -1) { 1018 nameentry = X509_NAME_get_entry(subject, loc); 1019 namedata = X509_NAME_ENTRY_get_data(nameentry); 1020 cnlen = ASN1_STRING_to_UTF8(&cn, namedata); 1021 if (ip == NULL && 1022 fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) 1023 ret = 1; 1024 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) 1025 ret = 1; 1026 OPENSSL_free(cn); 1027 } 1028 return (ret); 1029 } 1030 1031 /* 1032 * Verify that server certificate subjectAltName/CN matches 1033 * hostname. First check, if there are alternative subject names. If yes, 1034 * those have to match. Only if those don't exist it falls back to 1035 * checking the subject's CN. 1036 */ 1037 static int 1038 fetch_ssl_verify_hname(X509 *cert, const char *host) 1039 { 1040 struct addrinfo *ip; 1041 STACK_OF(GENERAL_NAME) *altnames; 1042 X509_NAME *subject; 1043 int ret; 1044 1045 ret = 0; 1046 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); 1047 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, 1048 NULL, NULL); 1049 1050 if (altnames != NULL) { 1051 ret = fetch_ssl_verify_altname(altnames, host, ip); 1052 } else { 1053 subject = X509_get_subject_name(cert); 1054 if (subject != NULL) 1055 ret = fetch_ssl_verify_cn(subject, host, ip); 1056 } 1057 1058 if (ip != NULL) 1059 freeaddrinfo(ip); 1060 if (altnames != NULL) 1061 GENERAL_NAMES_free(altnames); 1062 return (ret); 1063 } 1064 1065 /* 1066 * Configure transport security layer based on environment. 1067 */ 1068 static void 1069 fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) 1070 { 1071 long ssl_ctx_options; 1072 1073 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv3 | SSL_OP_NO_TICKET; 1074 if (getenv("SSL_NO_TLS1") != NULL) 1075 ssl_ctx_options |= SSL_OP_NO_TLSv1; 1076 if (getenv("SSL_NO_TLS1_1") != NULL) 1077 ssl_ctx_options |= SSL_OP_NO_TLSv1_1; 1078 if (getenv("SSL_NO_TLS1_2") != NULL) 1079 ssl_ctx_options |= SSL_OP_NO_TLSv1_2; 1080 if (getenv("SSL_NO_TLS1_3") != NULL) 1081 ssl_ctx_options |= SSL_OP_NO_TLSv1_3; 1082 fetch_verbose("SSL options: %lx", ssl_ctx_options); 1083 SSL_CTX_set_options(ctx, ssl_ctx_options); 1084 } 1085 1086 1087 /* 1088 * Configure peer verification based on environment. 1089 */ 1090 static int 1091 fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) 1092 { 1093 X509_LOOKUP *crl_lookup; 1094 X509_STORE *crl_store; 1095 const char *ca_cert_file, *ca_cert_path, *crl_file; 1096 1097 if (getenv("SSL_NO_VERIFY_PEER") == NULL) { 1098 ca_cert_file = getenv("SSL_CA_CERT_FILE"); 1099 ca_cert_path = getenv("SSL_CA_CERT_PATH"); 1100 if (verbose) { 1101 fetch_info("Peer verification enabled"); 1102 if (ca_cert_file != NULL) 1103 fetch_info("Using CA cert file: %s", 1104 ca_cert_file); 1105 if (ca_cert_path != NULL) 1106 fetch_info("Using CA cert path: %s", 1107 ca_cert_path); 1108 if (ca_cert_file == NULL && ca_cert_path == NULL) 1109 fetch_info("Using OpenSSL default " 1110 "CA cert file and path"); 1111 } 1112 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 1113 fetch_ssl_cb_verify_crt); 1114 if (ca_cert_file != NULL || ca_cert_path != NULL) 1115 SSL_CTX_load_verify_locations(ctx, ca_cert_file, 1116 ca_cert_path); 1117 else 1118 SSL_CTX_set_default_verify_paths(ctx); 1119 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { 1120 fetch_verbose("Using CRL file: %s", crl_file); 1121 crl_store = SSL_CTX_get_cert_store(ctx); 1122 crl_lookup = X509_STORE_add_lookup(crl_store, 1123 X509_LOOKUP_file()); 1124 if (crl_lookup == NULL || 1125 !X509_load_crl_file(crl_lookup, crl_file, 1126 X509_FILETYPE_PEM)) { 1127 fetch_info("Could not load CRL file %s", 1128 crl_file); 1129 return (0); 1130 } 1131 X509_STORE_set_flags(crl_store, 1132 X509_V_FLAG_CRL_CHECK | 1133 X509_V_FLAG_CRL_CHECK_ALL); 1134 } 1135 } 1136 return (1); 1137 } 1138 1139 /* 1140 * Configure client certificate based on environment. 1141 */ 1142 static int 1143 fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) 1144 { 1145 const char *client_cert_file, *client_key_file; 1146 1147 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { 1148 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? 1149 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; 1150 fetch_verbose("Using client cert file: %s", client_cert_file); 1151 fetch_verbose("Using client key file: %s", client_key_file); 1152 if (SSL_CTX_use_certificate_chain_file(ctx, 1153 client_cert_file) != 1) { 1154 fetch_info("Could not load client certificate %s", 1155 client_cert_file); 1156 return (0); 1157 } 1158 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, 1159 SSL_FILETYPE_PEM) != 1) { 1160 fetch_info("Could not load client key %s", 1161 client_key_file); 1162 return (0); 1163 } 1164 } 1165 return (1); 1166 } 1167 1168 /* 1169 * Callback for SSL certificate verification, this is called on server 1170 * cert verification. It takes no decision, but informs the user in case 1171 * verification failed. 1172 */ 1173 int 1174 fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) 1175 { 1176 X509 *crt; 1177 X509_NAME *name; 1178 char *str; 1179 1180 str = NULL; 1181 if (!verified) { 1182 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && 1183 (name = X509_get_subject_name(crt)) != NULL) 1184 str = X509_NAME_oneline(name, 0, 0); 1185 fetch_info("Certificate verification failed for %s", 1186 str != NULL ? str : "no relevant certificate"); 1187 OPENSSL_free(str); 1188 } 1189 return (verified); 1190 } 1191 1192 #endif 1193 1194 /* 1195 * Enable SSL on a connection. 1196 */ 1197 int 1198 fetch_ssl(conn_t *conn, const struct url *URL, int verbose) 1199 { 1200 #ifdef WITH_SSL 1201 int ret, ssl_err; 1202 X509_NAME *name; 1203 char *str; 1204 1205 if ((conn->ssl_ctx = SSL_CTX_new(TLS_client_method())) == NULL) { 1206 fetch_info("SSL context creation failed"); 1207 ERR_print_errors_fp(stderr); 1208 return (-1); 1209 } 1210 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); 1211 1212 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); 1213 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) 1214 return (-1); 1215 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) 1216 return (-1); 1217 1218 conn->ssl = SSL_new(conn->ssl_ctx); 1219 if (conn->ssl == NULL) { 1220 fetch_info("SSL connection creation failed"); 1221 ERR_print_errors_fp(stderr); 1222 return (-1); 1223 } 1224 SSL_set_fd(conn->ssl, conn->sd); 1225 1226 #if !defined(OPENSSL_NO_TLSEXT) 1227 if (!SSL_set_tlsext_host_name(conn->ssl, __DECONST(char *, URL->host))) { 1228 fetch_info("Failed to set TLS server name indication for host %s", 1229 URL->host); 1230 return (-1); 1231 } 1232 #endif 1233 while ((ret = SSL_connect(conn->ssl)) == -1) { 1234 ssl_err = SSL_get_error(conn->ssl, ret); 1235 if (ssl_err != SSL_ERROR_WANT_READ && 1236 ssl_err != SSL_ERROR_WANT_WRITE) { 1237 ERR_print_errors_fp(stderr); 1238 return (-1); 1239 } 1240 } 1241 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); 1242 1243 if (conn->ssl_cert == NULL) { 1244 fetch_info("No server SSL certificate"); 1245 return (-1); 1246 } 1247 1248 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { 1249 fetch_verbose("Verify hostname"); 1250 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { 1251 fetch_info("SSL certificate subject does not match host %s", 1252 URL->host); 1253 return (-1); 1254 } 1255 } 1256 1257 if (verbose) { 1258 fetch_info("%s connection established using %s", 1259 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl)); 1260 name = X509_get_subject_name(conn->ssl_cert); 1261 str = X509_NAME_oneline(name, 0, 0); 1262 fetch_info("Certificate subject: %s", str); 1263 OPENSSL_free(str); 1264 name = X509_get_issuer_name(conn->ssl_cert); 1265 str = X509_NAME_oneline(name, 0, 0); 1266 fetch_info("Certificate issuer: %s", str); 1267 OPENSSL_free(str); 1268 } 1269 1270 return (0); 1271 #else 1272 (void)conn; 1273 (void)verbose; 1274 (void)URL; 1275 fetch_info("SSL support disabled"); 1276 return (-1); 1277 #endif 1278 } 1279 1280 #ifdef WITH_SSL 1281 static ssize_t 1282 fetch_ssl_read(SSL *ssl, void *buf, size_t len) 1283 { 1284 ssize_t rlen; 1285 int ssl_err; 1286 1287 rlen = SSL_read(ssl, buf, len); 1288 if (rlen < 0) { 1289 ssl_err = SSL_get_error(ssl, rlen); 1290 switch (ssl_err) { 1291 case SSL_ERROR_ZERO_RETURN: 1292 return (0); 1293 case SSL_ERROR_WANT_READ: 1294 errno = EAGAIN; 1295 return (-1); 1296 case SSL_ERROR_SYSCALL: 1297 return (-1); 1298 default: 1299 errno = EPROTO; 1300 return (-1); 1301 } 1302 } 1303 return (rlen); 1304 } 1305 1306 static ssize_t 1307 fetch_ssl_write(SSL *ssl, void *buf, size_t len) 1308 { 1309 ssize_t wlen; 1310 int ssl_err; 1311 1312 wlen = SSL_write(ssl, buf, len); 1313 if (wlen < 0) { 1314 ssl_err = SSL_get_error(ssl, wlen); 1315 switch (ssl_err) { 1316 case SSL_ERROR_ZERO_RETURN: 1317 return (0); 1318 case SSL_ERROR_WANT_WRITE: 1319 errno = EAGAIN; 1320 return (-1); 1321 case SSL_ERROR_SYSCALL: 1322 return (-1); 1323 default: 1324 errno = EPROTO; 1325 return (-1); 1326 } 1327 } 1328 return (wlen); 1329 } 1330 #endif 1331 1332 /* 1333 * Read from a connection w/ timeout 1334 */ 1335 ssize_t 1336 fetch_read(conn_t *conn, void *buf, size_t len) 1337 { 1338 struct timeval now, timeout, delta; 1339 struct pollfd pfd; 1340 ssize_t rlen, total; 1341 int deltams; 1342 1343 if (fetchTimeout > 0) { 1344 gettimeofday(&timeout, NULL); 1345 timeout.tv_sec += fetchTimeout; 1346 } 1347 1348 deltams = INFTIM; 1349 pfd.fd = conn->sd; 1350 pfd.events = POLLIN; 1351 1352 total = 0; 1353 for (;;) { 1354 /* 1355 * The socket is non-blocking. Instead of the canonical 1356 * poll() -> read(), we do the following: 1357 * 1358 * 1) call read() or SSL_read(). 1359 * 2) if we received some data, return it. 1360 * 3) if read() or SSL_read() signaled EOF, return. 1361 * 4) if an error occurred, return -1. 1362 * 5) if we did not receive any data but we're not at EOF, 1363 * call poll(). 1364 * 1365 * In the SSL case, this is necessary because if we 1366 * receive a close notification, we have to call 1367 * SSL_read() one additional time after we've read 1368 * everything we received. 1369 * 1370 * In the non-SSL case, it may improve performance (very 1371 * slightly) when reading small amounts of data. 1372 */ 1373 #ifdef WITH_SSL 1374 if (conn->ssl != NULL) 1375 rlen = fetch_ssl_read(conn->ssl, buf, len); 1376 else 1377 #endif 1378 rlen = read(conn->sd, buf, len); 1379 if (rlen > 0) { 1380 /* something was read */ 1381 total += rlen; 1382 len -= rlen; 1383 if (len == 0) 1384 break; 1385 /* a partial read is success */ 1386 break; 1387 } else if (rlen == 0) { 1388 /* connection closed */ 1389 break; 1390 } else if (errno != EAGAIN) { 1391 /* error */ 1392 if (errno == EINTR && fetchRestartCalls) 1393 continue; 1394 fetch_syserr(); 1395 break; 1396 } 1397 /* check what's left of our timeout */ 1398 if (fetchTimeout > 0) { 1399 gettimeofday(&now, NULL); 1400 if (!timercmp(&timeout, &now, >)) { 1401 errno = ETIMEDOUT; 1402 fetch_syserr(); 1403 return (-1); 1404 } 1405 timersub(&timeout, &now, &delta); 1406 deltams = delta.tv_sec * 1000 + 1407 delta.tv_usec / 1000; 1408 } 1409 /* wait for the socket to become readable */ 1410 if (poll(&pfd, 1, deltams) < 0) { 1411 if (errno == EAGAIN) 1412 continue; 1413 if (errno == EINTR && fetchRestartCalls) 1414 continue; 1415 break; 1416 } 1417 } 1418 /* a partial read is success */ 1419 if (rlen < 0 && total == 0) 1420 return (-1); 1421 return (total); 1422 } 1423 1424 1425 /* 1426 * Read a line of text from a connection w/ timeout 1427 */ 1428 #define MIN_BUF_SIZE 1024 1429 1430 ssize_t 1431 fetch_getln(conn_t *conn) 1432 { 1433 char *tmp; 1434 size_t tmpsize; 1435 ssize_t rlen; 1436 1437 /* allocate initial buffer */ 1438 if (conn->buf == NULL) { 1439 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) 1440 goto fail; 1441 conn->line = conn->buf; 1442 conn->bufsize = MIN_BUF_SIZE; 1443 conn->buflen = 0; 1444 conn->pos = 0; 1445 } 1446 1447 /* look at the data we already have */ 1448 if (conn->pos < conn->buflen) { 1449 conn->line = conn->buf + conn->pos; 1450 while (conn->pos < conn->buflen) 1451 if (conn->buf[conn->pos++] == '\n') 1452 goto found; 1453 /* reset for the upcoming memmove() */ 1454 conn->pos = conn->line - conn->buf; 1455 } 1456 1457 /* move residual data up */ 1458 if (conn->buflen > 0) { 1459 if (conn->pos < conn->buflen) { 1460 memmove(conn->buf, conn->buf + conn->pos, 1461 conn->buflen - conn->pos); 1462 } 1463 conn->buflen -= conn->pos; 1464 conn->pos -= conn->pos; 1465 conn->line = conn->buf; 1466 } 1467 1468 for (;;) { 1469 /* read as much as we can right now */ 1470 rlen = fetch_read(conn, conn->buf + conn->buflen, 1471 conn->bufsize - conn->buflen - 1); 1472 /* error */ 1473 if (rlen < 0) 1474 goto fail; 1475 /* advance and terminate */ 1476 conn->buflen += rlen; 1477 conn->buf[conn->buflen] = '\0'; 1478 /* connection closed */ 1479 if (rlen == 0) 1480 break; 1481 /* look for a newline */ 1482 while (conn->pos < conn->buflen) 1483 if (conn->buf[conn->pos++] == '\n') 1484 goto found; 1485 /* do we need a bigger buffer? */ 1486 if (conn->buflen > conn->bufsize / 2) { 1487 tmp = conn->buf; 1488 tmpsize = conn->bufsize * 2; 1489 if ((tmp = realloc(tmp, tmpsize)) == NULL) 1490 goto fail; 1491 conn->line = conn->buf = tmp; 1492 conn->bufsize = tmpsize; 1493 } 1494 } 1495 /* connection closed, return what's left */ 1496 conn->pos = conn->buflen; 1497 found: 1498 conn->linelen = (conn->buf + conn->pos) - conn->line; 1499 if (conn->linelen > 0 && conn->line[conn->linelen - 1] == '\n') 1500 conn->line[--conn->linelen] = '\0'; 1501 if (conn->linelen > 0 && conn->line[conn->linelen - 1] == '\r') 1502 conn->line[--conn->linelen] = '\0'; 1503 DEBUGF("<<< %.*s\n", (int)conn->linelen, conn->line); 1504 return (conn->linelen); 1505 fail: 1506 conn->line = NULL; 1507 conn->linelen = 0; 1508 return (-1); 1509 } 1510 1511 1512 /* 1513 * Read from a connection, taking previously buffered data into account. 1514 */ 1515 ssize_t 1516 fetch_bufread(conn_t *conn, void *buf, size_t len) 1517 { 1518 ssize_t rlen; 1519 1520 /* avoid overflow */ 1521 if (len > SSIZE_MAX) 1522 len = SSIZE_MAX; 1523 1524 /* allocate initial buffer */ 1525 if (conn->buf == NULL) { 1526 conn->bufsize = MIN_BUF_SIZE; 1527 while (conn->bufsize < len) 1528 conn->bufsize *= 2; 1529 if ((conn->buf = malloc(conn->bufsize)) == NULL) 1530 return (-1); 1531 conn->buflen = 0; 1532 conn->pos = 0; 1533 } 1534 conn->line = NULL; 1535 conn->linelen = 0; 1536 1537 /* return residual data first */ 1538 if (conn->buflen > conn->pos) { 1539 if (len > conn->buflen - conn->pos) 1540 rlen = conn->buflen - conn->pos; 1541 else 1542 rlen = len; 1543 memcpy(buf, conn->buf + conn->pos, rlen); 1544 conn->pos += rlen; 1545 return (rlen); 1546 } 1547 1548 return (fetch_read(conn, buf, len)); 1549 } 1550 1551 1552 /* 1553 * Write to a connection w/ timeout 1554 */ 1555 ssize_t 1556 fetch_write(conn_t *conn, const void *buf, size_t len) 1557 { 1558 struct iovec iov; 1559 1560 iov.iov_base = __DECONST(char *, buf); 1561 iov.iov_len = len; 1562 return (fetch_writev(conn, &iov, 1)); 1563 } 1564 1565 /* 1566 * Write a vector to a connection w/ timeout 1567 * Note: can modify the iovec. 1568 */ 1569 ssize_t 1570 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) 1571 { 1572 struct timeval now, timeout, delta; 1573 struct pollfd pfd; 1574 ssize_t wlen, total; 1575 int deltams; 1576 1577 if (fetchTimeout > 0) { 1578 gettimeofday(&timeout, NULL); 1579 timeout.tv_sec += fetchTimeout; 1580 } 1581 1582 deltams = INFTIM; 1583 pfd.fd = conn->sd; 1584 pfd.events = POLLOUT; 1585 1586 total = 0; 1587 for (;;) { 1588 /* 1589 * The socket is non-blocking. Instead of the canonical 1590 * poll() -> write(), we do the following: 1591 * 1592 * 1) call write() or SSL_write(). 1593 * 2) if we wrote everything, return success. 1594 * 3) if write() or SSL_write() signaled EOF before we 1595 * wrote everything, return -1. 1596 * 4) if an error occurred, return -1. 1597 * 5) if we did not write everything but we're not at EOF, 1598 * call poll(). 1599 */ 1600 #ifdef WITH_SSL 1601 if (conn->ssl != NULL) { 1602 wlen = fetch_ssl_write(conn->ssl, 1603 iov->iov_base, iov->iov_len); 1604 } else 1605 #endif 1606 wlen = writev(conn->sd, iov, iovcnt); 1607 if (wlen > 0) { 1608 /* something was written */ 1609 total += wlen; 1610 /* skip iovs which were completely written */ 1611 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { 1612 wlen -= iov->iov_len; 1613 iov++; 1614 iovcnt--; 1615 } 1616 /* are we done? */ 1617 if (iovcnt == 0) 1618 break; 1619 /* skip written portion of current iov */ 1620 iov->iov_len -= wlen; 1621 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; 1622 /* a partial write is incomplete */ 1623 continue; 1624 } else if (wlen == 0) { 1625 /* connection closed */ 1626 break; 1627 } else if (errno != EAGAIN) { 1628 /* error */ 1629 if (errno == EINTR && fetchRestartCalls) 1630 continue; 1631 fetch_syserr(); 1632 break; 1633 } 1634 /* check what's left of our timeout */ 1635 if (fetchTimeout > 0) { 1636 gettimeofday(&now, NULL); 1637 if (!timercmp(&timeout, &now, >)) { 1638 errno = ETIMEDOUT; 1639 fetch_syserr(); 1640 return (-1); 1641 } 1642 timersub(&timeout, &now, &delta); 1643 deltams = delta.tv_sec * 1000 + 1644 delta.tv_usec / 1000; 1645 } 1646 /* wait for the socket to become writeable */ 1647 if (poll(&pfd, 1, deltams) < 0) { 1648 if (errno == EAGAIN) 1649 continue; 1650 if (errno == EINTR && fetchRestartCalls) 1651 continue; 1652 return (-1); 1653 } 1654 } 1655 /* a partial write is failure */ 1656 if (iovcnt > 0) 1657 return (-1); 1658 return (total); 1659 } 1660 1661 1662 /* 1663 * Write a line of text to a connection w/ timeout 1664 */ 1665 int 1666 fetch_putln(conn_t *conn, const char *str, size_t len) 1667 { 1668 struct iovec iov[2]; 1669 int ret; 1670 1671 DEBUGF(">>> %s\n", str); 1672 iov[0].iov_base = __DECONST(char *, str); 1673 iov[0].iov_len = len; 1674 iov[1].iov_base = __DECONST(char *, ENDL); 1675 iov[1].iov_len = sizeof(ENDL); 1676 if (len == 0) 1677 ret = fetch_writev(conn, &iov[1], 1); 1678 else 1679 ret = fetch_writev(conn, iov, 2); 1680 if (ret == -1) 1681 return (-1); 1682 return (0); 1683 } 1684 1685 1686 /* 1687 * Close connection 1688 */ 1689 int 1690 fetch_close(conn_t *conn) 1691 { 1692 int ret; 1693 1694 if (--conn->ref > 0) 1695 return (0); 1696 #ifdef WITH_SSL 1697 if (conn->ssl) { 1698 SSL_shutdown(conn->ssl); 1699 SSL_set_connect_state(conn->ssl); 1700 SSL_free(conn->ssl); 1701 conn->ssl = NULL; 1702 } 1703 if (conn->ssl_ctx) { 1704 SSL_CTX_free(conn->ssl_ctx); 1705 conn->ssl_ctx = NULL; 1706 } 1707 if (conn->ssl_cert) { 1708 X509_free(conn->ssl_cert); 1709 conn->ssl_cert = NULL; 1710 } 1711 #endif 1712 ret = close(conn->sd); 1713 free(conn->buf); 1714 free(conn); 1715 return (ret); 1716 } 1717 1718 1719 /*** Directory-related utility functions *************************************/ 1720 1721 int 1722 fetch_add_entry(struct url_ent **p, int *size, int *len, 1723 const char *name, struct url_stat *us) 1724 { 1725 struct url_ent *tmp; 1726 1727 if (*p == NULL) { 1728 *size = 0; 1729 *len = 0; 1730 } 1731 1732 if (*len >= *size - 1) { 1733 tmp = reallocarray(*p, *size * 2 + 1, sizeof(**p)); 1734 if (tmp == NULL) { 1735 errno = ENOMEM; 1736 fetch_syserr(); 1737 return (-1); 1738 } 1739 *size = (*size * 2 + 1); 1740 *p = tmp; 1741 } 1742 1743 tmp = *p + *len; 1744 snprintf(tmp->name, PATH_MAX, "%s", name); 1745 memcpy(&tmp->stat, us, sizeof(*us)); 1746 1747 (*len)++; 1748 (++tmp)->name[0] = 0; 1749 1750 return (0); 1751 } 1752 1753 1754 /*** Authentication-related utility functions ********************************/ 1755 1756 static const char * 1757 fetch_read_word(FILE *f) 1758 { 1759 static char word[1024]; 1760 1761 if (fscanf(f, " %1023s ", word) != 1) 1762 return (NULL); 1763 return (word); 1764 } 1765 1766 static int 1767 fetch_netrc_open(void) 1768 { 1769 struct passwd *pwd; 1770 char fn[PATH_MAX]; 1771 const char *p; 1772 int fd, serrno; 1773 1774 if ((p = getenv("NETRC")) != NULL) { 1775 DEBUGF("NETRC=%s\n", p); 1776 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { 1777 fetch_info("$NETRC specifies a file name " 1778 "longer than PATH_MAX"); 1779 return (-1); 1780 } 1781 } else { 1782 if ((p = getenv("HOME")) == NULL) { 1783 if ((pwd = getpwuid(getuid())) == NULL || 1784 (p = pwd->pw_dir) == NULL) 1785 return (-1); 1786 } 1787 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) 1788 return (-1); 1789 } 1790 1791 if ((fd = open(fn, O_RDONLY)) < 0) { 1792 serrno = errno; 1793 DEBUGF("%s: %s\n", fn, strerror(serrno)); 1794 errno = serrno; 1795 } 1796 return (fd); 1797 } 1798 1799 /* 1800 * Get authentication data for a URL from .netrc 1801 */ 1802 int 1803 fetch_netrc_auth(struct url *url) 1804 { 1805 const char *word; 1806 int serrno; 1807 FILE *f; 1808 1809 if (url->netrcfd < 0) 1810 url->netrcfd = fetch_netrc_open(); 1811 if (url->netrcfd < 0) 1812 return (-1); 1813 if ((f = fdopen(url->netrcfd, "r")) == NULL) { 1814 serrno = errno; 1815 DEBUGF("fdopen(netrcfd): %s", strerror(errno)); 1816 close(url->netrcfd); 1817 url->netrcfd = -1; 1818 errno = serrno; 1819 return (-1); 1820 } 1821 rewind(f); 1822 DEBUGF("searching netrc for %s\n", url->host); 1823 while ((word = fetch_read_word(f)) != NULL) { 1824 if (strcmp(word, "default") == 0) { 1825 DEBUGF("using default netrc settings\n"); 1826 break; 1827 } 1828 if (strcmp(word, "machine") == 0 && 1829 (word = fetch_read_word(f)) != NULL && 1830 strcasecmp(word, url->host) == 0) { 1831 DEBUGF("using netrc settings for %s\n", word); 1832 break; 1833 } 1834 } 1835 if (word == NULL) 1836 goto ferr; 1837 while ((word = fetch_read_word(f)) != NULL) { 1838 if (strcmp(word, "login") == 0) { 1839 if ((word = fetch_read_word(f)) == NULL) 1840 goto ferr; 1841 if (snprintf(url->user, sizeof(url->user), 1842 "%s", word) > (int)sizeof(url->user)) { 1843 fetch_info("login name in .netrc is too long"); 1844 url->user[0] = '\0'; 1845 } 1846 } else if (strcmp(word, "password") == 0) { 1847 if ((word = fetch_read_word(f)) == NULL) 1848 goto ferr; 1849 if (snprintf(url->pwd, sizeof(url->pwd), 1850 "%s", word) > (int)sizeof(url->pwd)) { 1851 fetch_info("password in .netrc is too long"); 1852 url->pwd[0] = '\0'; 1853 } 1854 } else if (strcmp(word, "account") == 0) { 1855 if ((word = fetch_read_word(f)) == NULL) 1856 goto ferr; 1857 /* XXX not supported! */ 1858 } else { 1859 break; 1860 } 1861 } 1862 fclose(f); 1863 url->netrcfd = -1; 1864 return (0); 1865 ferr: 1866 serrno = errno; 1867 fclose(f); 1868 url->netrcfd = -1; 1869 errno = serrno; 1870 return (-1); 1871 } 1872 1873 /* 1874 * The no_proxy environment variable specifies a set of domains for 1875 * which the proxy should not be consulted; the contents is a comma-, 1876 * or space-separated list of domain names. A single asterisk will 1877 * override all proxy variables and no transactions will be proxied 1878 * (for compatibility with lynx and curl, see the discussion at 1879 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>). 1880 */ 1881 int 1882 fetch_no_proxy_match(const char *host) 1883 { 1884 const char *no_proxy, *p, *q; 1885 size_t h_len, d_len; 1886 1887 if ((no_proxy = getenv("NO_PROXY")) == NULL && 1888 (no_proxy = getenv("no_proxy")) == NULL) 1889 return (0); 1890 1891 /* asterisk matches any hostname */ 1892 if (strcmp(no_proxy, "*") == 0) 1893 return (1); 1894 1895 h_len = strlen(host); 1896 p = no_proxy; 1897 do { 1898 /* position p at the beginning of a domain suffix */ 1899 while (*p == ',' || isspace((unsigned char)*p)) 1900 p++; 1901 1902 /* position q at the first separator character */ 1903 for (q = p; *q; ++q) 1904 if (*q == ',' || isspace((unsigned char)*q)) 1905 break; 1906 1907 d_len = q - p; 1908 if (d_len > 0 && h_len >= d_len && 1909 strncasecmp(host + h_len - d_len, 1910 p, d_len) == 0) { 1911 /* domain name matches */ 1912 return (1); 1913 } 1914 1915 p = q + 1; 1916 } while (*q); 1917 1918 return (0); 1919 } 1920